textproduct: Quad Cities

KEY MESSAGES

- Mild and less humid airmass will remain through the remainder of the work week, with heat and humidity returning this weekend and beyond. Heat indices nearing 100 or more will be possible for some.

- Mostly dry conditions will remain for much of the area, with areas in our south seeing chances for showers/storms Friday. Otherwise, we will remain dry through the weekend.

SHORT TERM /THROUGH FRIDAY/

Issued at 240 PM CDT Wed Jul 22 2026

Surface high pressure will slowly pass through the area through Thursday, keeping mild temperatures in place with lower humidity. Tonight will be another beautiful night, with mostly clear skies and unseasonably cool temperatures in the low-mid 50s. Light and variable winds will also result, trending southeasterly Thursday onward, with a mix of sun and a diurnal cumulus field. Enjoy the beautiful weather through midweek.

Thursday night into Friday, a weak wave will eject off of the Rockies and track towards the area. Moisture return will be slow to arrive, limiting precipitation chances to Friday into Friday afternoon. There is the chance that the best moisture doesn't make it to the area, which could result in a largely dry forecast. Although, guidance seems to favor areas along/south of Highway 34 for precipitation chances (30-60%). Much of guidance continues to show a decreasing trend in PoPs, shifting south of the area. The most aggressive model is the Euro, bringing heavier rainfall for these areas in the south. Although confidence in that is low at this time, with it being an outlier to the remainder. Thus, will continue to mention the chance for light rain, especially south of Highway 34, with isolated thunder possible. Guidance currently favors upwards to 0.50" in our far south, with 0.10-0.25" northward towards Highway 34. Confidence in amounts is low. Severe weather is not expected at this time either. Areas north of Highway 34 will see a mix of clouds/sun and mild temperatures in the mid-upper 70s.

LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/

Issued at 240 PM CDT Wed Jul 22 2026

As the shortwave trough passes through the CWA Friday night, ridging sets back in over the Central Plains as a high pressure slides in along the Iowa-Missouri border behind a weak cold front on Saturday. Westerly flow will take hold in the low levels, limiting our cold air advection. Highs are forecast to jump into the mid-to- upper 80s on Saturday and climb further into early next week. Another ridge-riding shortwave is expected to deepen a new low pressure center over south-central Canada on Sunday and introduce southerly flow back to the area. Combining the low- level moisture advection and peak evapotranspiration from the crops, dew points will likely (60-80%) soar back into the mid-70s. Current LREF guidance has 40-70% probabilities for heat indices exceeding 100 degrees, mainly along and south of Interstate 80.

Heading into Monday, a cold front pushes southward into Minnesota, northern Iowa, and Wisconsin, increasing PoPs (10-20% coverage) along a thin axis of mid-level moisture. Highs and dew points will be similar to Sunday, but additional cloud cover could help lessen heat impacts. By Monday night, the cold front should clear most of the CWA as high pressure over Minnesota advects in some cooler, drier air from the north for Tuesday and Wednesday. Highs in the low-to-mid 90s on Monday (50-70% chance) should slowly sink into the upper 80s by Wednesday as dew points fall back into the mid-to-upper 60s (50-80% chance).

Continual ridging over the South-Central Plains is expected to limit any significant cooldown during the middle of next week, but gradual retrograding of the ridge to the southwest should open the door to additional trough passages late next week.

AVIATION /00Z TAFS THROUGH 00Z FRIDAY/

Issued at 630 PM CDT Wed Jul 22 2026

High pressure will remain to our west tonight with light and variable winds across the area. Expecting a scattered deck of stratocu between 4 to 6 kft with clouds thickening to bkn tomorrow after 16 UTC. Winds will turn to the southeast after 16 UTC with speeds around 5 knots. This results in VFR conditions through the TAF period.

DVN WATCHES/WARNINGS/ADVISORIES

IA...None. IL...None. MO...None.